Work-holder.



G. HAHN.

WORK HOLDER. APPLIUATION lHmm JUNI: 4, 1910.

Patented Jan. 24, 1911.

sannita-SHEET 1.

i @howto/a w/ye Ea/m @W j l al'ofmut G. HAHN.

WORK HOLDER.

APPLIOATIONIILED JUNM, 1910,

" 982,668. -Patented Jan.24. 1911.

WW www 2 SHEETS-SHEET Z.

@wam/Lto@ UNITED sT-ArEs PATENT oEEroE.

GEQRGE HAHN, 0F NEW YORK, N. Y.

'WORK-HOLDER.

Specification of Letters atent.

l Patented J an. 24, 1911,

Application filed June 4, 1810. Serial No. 564,984. y

l To all whom it mag/concerm holderwhich will admit of the openings bc- I ing accurately bored at the required' angle or regularly spaced in the eventof several openings being required at regular intervals.

The inventionconsists `of the novel features, details of construction and combination of parts, which hereinafter will be more particularly set forth, illustrated in the accompanying drawings, and pointed out in the appended claims.

Referring to the drawings, forming a y part of the application, Figure 1 is a .per-

spective view of a work holder or chuck as it will appear when securing a piece of work to be bored. Fig. 2 is a horizontal section of the chuck, the work being removed. A Fig.

,3 is a vertical central section. l Fig. 4 is a view showing different styles of centers. F1g. 51s a vlewshowingdifferent formsl of gages.

Corresponding and like parts are referred lto in the :following description, and indicated in all the views of thedrawings, by the same reference characters. The-chuck or body thereof comprises a stern` 1 and ahead 2, the latter bein Vprovided at its ends with wings 3, which y preference curve. The

. stem 1 is formed with an opening which is internally threaded to admit of securing the chuck toa tool, post or other support. The wings 3 are provided with threaded openl' ings, the latter being reinforced so as to provide extended bearings for spindles 4,

which are located in line and are provided at.

their inner ends with removable centers or workl gripping jaws 5. The centers or jaws 5 may be of varyngform, as indicated in the several views and more particularly in JFig. '4, thereby adapting the chuck for a variety of work. The centers or work grip ping jaws 5 may be fitted to the spindles 4' in any manner, but it is preferred to have the inner ends ofthe spindles formed with threaded openings to receive the threaded Aings `may 4 .threaded 1nto Vthe wings '3 the spindles may be adjusted to admit of different sizes of workl being gripped between them. Set screws 6 threaded into openings formed in the wings 3 are adapted to have their inner ends engage the spindles 4 so as to secure the latten in the adjusted position. The spindles 4 may be turned by anyineans fitted to the 4outer ends thereof. heads of the spindles are made angular to receive a suitable wrench or Spanner.

Lugs T are provided at opposite points upon the body of the chuck and form supports for gages S. The lugs 7 are located yupon opposite sides ofthe stein 1 opposite the spaces formed between the wings 3, andrecesses Yare formed in their'outer sides to receive ythe gages 8, the side walls of the recesses being undercut andJ the outer edges of the gages correspondingly beveled so as to retain the gages in place. While itis preferred toI provide two gages it is to be understood that one of t-he ga es may be, dispensed'with. The gagesS consist of plates in whichl longitudinal slots 9 are forined'to As 'shown the i stems of the arts 5. By having the spindles y receive set screws 10, which are threaded into the lug 7 and are adapted to secure the gagesin the adjusted position. The gages are pro vided lwith scale indications to admit of positioning the gages withaccurac The outer or forward ends of the gages ave recesses 11 which may `be differently formed according to the the coperating plied to the wor l of a bar having a threaded en 14, which is adapted to enter .the threaded opening formed in the work 13. Thegage 12 'may be of square form in cross section or 'of any outline according to the number of openings cross sectional outline of age 12, which latter is ap-` 13. The ga e 12 consists` to be drilled into the work so that by turnl .infr4 the work after the gage has been ap plled thereto openingsmay be drilled into the work at points corresponding with the sides of the gage or bar 12. In the event of Vthe gage bar 12 beingb of zsgiieisnfggistg 'or four openings may e'dri of the work at equal distances. -In the event ofthe gage bar being hexagonal in cross section three or six openlngs may :drilled in the'sides of the work at regular mteryals apart. By providing 'a number of di prent forms of Gage bars 12 anyl number o e drilled in the `sidesef thevwork at uniform distances.

open?.

By mevingfthesagrs- 8 forward or rearward the inclination'of the openings drilled into the work may be` regulated.

From the foregoing description', taken in connection with the accompanying draW- ings, the advantages of'the construction and of the method of operation will be readily apparent to those skilled inv the art towhich the invention appertains, and while I have described the princijfleioi:l operation of the invention, together with: the device which 'I now'eonsider to be the embodiment thereof,

I desire to havev it understood that the device shown is merely illustrative, and that such changes may"bemade when desired as are vwithin the scope ofthe claims appended i hereto.

-is-claimed as new, is

Having thus described the invention what l. A Work holder comprising ahead, oppositely disposed work gripping members adjustably mounted upon the head and pro- V'ded with work centering jaws to admit of 'securing the work ina variety of positions,

and-a gage adjustably mounted upon said y head and arranged opposite the space A to fix the mounted upon said head to properly position the work, and a second gage adapted'to be t securedto the Work and designed t'o coperate with the gage applied to the said head.

3. A Work holder comprising a head, op-

positely disposed Work` gripping members mounted :upon said head, and a gage adapted j to be secured to the Work forproperly posi- ;"tioni'ng ythe Work according vto the desired result-'to be effected.

i. A work holder vcomprising a head, op-

positely disposed work gripplng members to aline, work gripping'jaws movably tted to the inner ends of the spindles, and a gage mounted `upon said head and adjustable to` ward and from said spindles'to vary the relative inclination of the work.

6. A work holder comprising a body, oppositely disposed Work gripping members mounted upon the body, a gageadjust-able upon the body` and having a recess in its outer end, and a gage bar to be fitted to-the work and adapted to fit the recess of the gage mounted upon the head to properly position the work. i

7. The herein described work holder comprising a stem having a threaded opening, a head at one end of the stem, wings at the ends of the heady provided with threaded openings, spindles'niounted in said threaded openings, Work gripping centers detachably fitted to the inner ends of the spindles, set screws for securing thespindles in the adjusted position, gages adjustably mounted upon the stem opposite the spaces formed between the wings, and ax gage bar to be fitted tothe work and adapted to coperate with either one of the aforesaid gages.

In testimony whereof I afix my signature in presence of two witnesses.

GEORGE HAI-IN.

Witnesses PATRICK POWERS, DAVID MACINTYRE. 

